This is a new Passive House, in a rural area. I'm finalizing details before we build.
Hip roof, pitch 6-12, Roof trusses 16oc, cathedral ceiling.
Insulation will be 20" dense pack cellulose between top and bottom cords of truss.
Primary roof closure: OSB with synthetic underlayment taped or ZIP sheathing taped. (unvented)
2x4 vertical battens, with 1/2" or 5/8" plywood decking, synthetic underlayment and Union Corrugated 1" Advantage-LokII metal roof.
The primary roof is permeable and vent above.
Thanks for any input you have.
Guest User
2017-06-07 16:02:03.000000
So, I take it the plan is decking, vertical battens, more decking, and more underlayment, and then roofing? If that is the case, it sounds like a good plan for energy efficiency and ice dam resistance. I am not sure that underlayment on top of the lower layer of decking is really necessary but I see no harm either.